Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA786273A
Inventor
Kamoshita Gen-Ichi
Hirano Mikio
Hara Nobuhiro
Shiba Junko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Publication date
Application grantedgrantedCritical
Publication of CA786273ApublicationCriticalpatent/CA786273A/en